What role does Stuhlprobe play in Langlebigkeit?

Stool sample (microbiome analysis) is increasingly marketed as a tool to assess gut health in the context of longevity. Associations exist between certain microbiome profiles and age-related processes such as chronic inflammation, metabolic regulation, and immune function. However, the evidence is complex: most studies are cross-sectional or animal-based, and causal proof that stool tests directly extend lifespan is lacking. The microbiome is heavily shaped by diet, medications, exercise, and environment—factors themselves linked to longevity. A single stool sample therefore does not provide a reliable 'longevity diagnosis.' It may be useful as part of a holistic assessment but should not be overinterpreted. Evidence is mixed: mechanistic and observational hints exist, but no robust clinical trials demonstrate a direct lifespan benefit. Caution against exaggerated marketing claims is warranted.